Pull switch



Nov. 3-, 1925.

1,560,197 R. B. BENJAMIN PULL SWITCH File'd May 18 1922 2 Sheets-Sheet 1 INVEINT UR Nov. 3 1925- RB. BENJAMIN PULL swmbn Filed May 18 1922 2 Sheets-Sheet 2 Patented Nov. 3, 1925.

UNITEII STATES PATEN- REUBEN B. BENJAMIN, OF CHICAGO, ILLINOIS, ASSIGNOR 'ro NJAMIN ELECTRIC MANUFACTURING COMPANY, OF

Application filed May 18, 1922. Seria1No. 561,861.

To all whom it may concern:

Be it known that I, REUBEN B. BENJA- MIN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful. Improvements in Pull Switches, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of this specification.

My invention relates to pull switches. One of the objects of my invention is to provide an improved pull switch mechanism in which provision is made for an angular adjustment between the swltch mechanism and the tubular guide for the flexible pull member.

A further object of my invention is to provide an improved pull switch mechanism in which the switch mechanism may be angularly adjusted with respect to the means which secure it to its'canopy or housing, so that the switch mechanism may be properly supported.

Further objects will appear from the detailed description to follow and from the appended claims.

In the drawings in which an embodiment of my invention is shown Figure 1 is a sectional View showing a pull switch mechanism mounted in a canopy? Fig. 2 1s a plan new of the switch mechanism;

Fig. 3 is a section onthe line 3-3 of Fig. 2;

Fig. 4 is a bottom plan view of the switch mechanism; 1 p I Fig. 5 is a sectionon the line 55 of Fig. 4;

Fig. 6 is a detail View of a bearing bracket for the commutator;

Fig. 7 is a detail View of the horn and mounting bracket, and

Fig.8 is a section on the line 8-8 of Fig. 7

The construction shown in the drawing comprises a pull switch mechanism 10 adjustably mounted in a canopy 11. This pull switch mechanism is adjustably'secured to thecanopy, by means of the horn or chain guide 12,through whichthe-pull chain 13 extends. h I I u In order thatthe pull switch mechanism 10 maybe properly supported in the canopy 11, it is made angularly adjustable with respectto the horn 12 securedto the canopy, sothat the pull switchmechanismmay be tilted to bring it into position to be supportedby the canopy 11, as indicatedat the points 14; and 15. Thus thepull switch mechanism 10 can be tilted untilsome part of it comes into contact withsome part of thecanopy to give it a support in. addition to thesupport furnished it by the clamp ing action ofthe horn 12 on the canopy 11.

Thisangular adjustment between the horn 12 and pull switch mechanism 10 is effected by mounting the horn 12, on a curved bracket 16. As shown in'Fig. 8 the horn 12 has a threaded shank portion 17 which extends through an opening in the canopy 11 (Fig. 1) and also through the slot 18 in the curved bracket 16, and is threaded into a nut 19. WVhen the parts are inassembled position as shown in Fig. 1, and the shank 17 is screwed tightly into the nut 19, the result is to draw the bracket 16 firmly against the canopy 11, the canopy being clamped between this bracket and the outer portion of the horn or chain guide 12.

In order to prevent'the nut.19 from'turns ing when the shank of the horn 12 is screwed into it, the bracket 16, which may be a sheet metal stamping, is'provided with integral parallel cheek pieces 20, between which the nut 19. lies. To further assist in positioning the nut 19 andholding it in place, the bracket 16 is provided with a turned up portion 21, which will assist in holding the nut in place when the born 12 is unscrewed from the nut. The bracket 16 is held in place on the insulating switch base 22 by means of a pair of screws 23 (Figs. 4 and 5) extending through registering openings in thebracket 16 andswit-ch base 22, and threaded into the anchorage brackets 24 respectively.

The switch mechanism per se forms no part of the invention claimed in this ap Tl F C CHICAGO, ILL NOIS, A CORPORATION or ILLINoIs. 1'

plication. In a general wayit comprises a rotatable commutator or cam wheel 25, mounted in a recess 26 in the insulating base 22, and given a step-by-step movement by means of a pull chain 13. Successive movements of the cam wheel 25 make and break the circuit between the wiring terminals 27 and 28 of the switch.

. The cam wheel. 25 comprises a ing cam 29, terminating in a relatively large drop at 30, and a non-conducting cam 31 terminating in a relatively small drop at 32. Cooperating with these cams 29 and 31 are a pair'of yielding con'-. tact members 33 and 34, the contact 84: being electrically connected with the wiring terminal 27 sulated both from the rotatable contact 29 and the contact 34e in the off position of the switch as shown in Fig. 3. The rotatable cam 29 is always electrically "connected with the wiring terminal 28' through the inwardconductly extending conducting arm 35' and the switch shaft oripin 35, which is mounted in a-hookelike bearing bracket 36 formedas air-integral part oft'h'e stamping from which the binding plate 37 of the wiring terminal" 28 is formed.

\Vit-hthe switch in ofi' iposition as'shown in Fig. 3, if the chain '1'3* is pulled to move the camwheel 25 through 180 deg'rees,t iis gradually brings the "contact into engageirient with the contact 34 and when the contact 33 snaps'ofi from the small drop at 3'3'on the conducting cam-29, the circuit is established betweenthe wiring "terminals 28 and 27 through thecontacts'34, and 29, and the radially extending conductor 35, switch .p'in 35 'and bearing bracket 36 When the switch is in :on position, and the chain 13 is pulled to move it to of? position, at the latter part of the movement tlre Contact 33 snaps of? from the rear end of *the conducting cam 29, and because of the relatively :g'reat drop',the contact 33 snapsout of engagement with the contact 34 so that the circuit is broken at two poiiits.

An insulating cover 38 1( Fig. 5.) is pro vided to cover up the switch mechanism, this cover 38 being securedto the insulating base 22 by means of a :pair of screws 39 threaded into-the anchorage members 24.-

A In mounting the switch 'on the canopy, the switch with the mounting bracket 16 is placed in position in the canopy with the bracket 16 adjacent the opening in the canopy, the shank 17 of the horn 12 is inserted through the opening and threaded iuto the nut 19, and the switch is then slipped in one direction or the other if necessary to bring it into bearing engagement with the canopy as indicated at 14 and 15, so that the switch will be firmly supported. The horn 12 is their screwed up tightly -to :hold the switch inxthe posi and thecontact 33 being in angi-nsulating base, a pull switch mechanism mounted thereon, a pull member, a curved slotted braoket a tubular guide for the pull member having a shank portion extending into said slot whereby relative adjustment between said curved. slottedbracket and tubular 'iguid e may "be "effected, and a nut into which said shank is threaded.

2. The combination with a canopy hav ing an opening therein, of a' pull switch mechanism comprising an insulating base, a circuit controlling mechanism mounted thereon, a flexible ,pull member wi or 'operating said circuit controlling mechanism, ;a curved supporting member secured to said insulating base, and a tubular guiding and attaching member :for guiding :said' pull member and clamping said curved supporting member on said canopy, said curved supporting. member being adjustable rela-. tively to said guiding and attaching member, whereby said insulating base may be adjusted in position'to be supported by said canopy;-

3. pull switch mechanism comprising an insulating base, a circuit controlling mechanism mounted thereon, a flexible pull member for operating said circuit controlling mechanism,- a tubular guide tor said pull member, a curved supporting member secured to said insulating base, on which member said tubularguide is mounted, :and means for securing said'tubular member in various positions along said :curved member to effect relative angular adjustment be tween said tubular guide and said insulat mg base;

4. The combination with a canopy having an opening therein, of a pull switch mechanism comprising an insulating *bas'e, circuit controlling .mechanism mounted thereon, a flexible pull member 'foroperating; said circuit *controlling mechanism and a tubular guiding and attaching member adjacent said opening for 'guiding said pull member and securing said insulating base on said canopy, said insulating base being angularly adjustable with respect to said tubular member whereby it may be adjusted into position to be supported by said can- 5. A pull switch 1T16Gh3J11S111COmpr1S ng an insulating base, a circuit-controlling mechanism mounted thereon, a iflexible pull member for operating said circuit-controlling mechanism, a support and means for guiding said pull member and clamping said insulating base on said support com- 5 prising a tubular screw-threaded member through which said flexible pull member passes, and a member secured to said insulating base and having screw-threaded engagement with said screw-threaded tubular member.

In Witness whereof, I have hereunto subscribed my name.

REUBEN B. BENJAMIN. 

